import numpy as np
# arr1=np.arange(1,4)
# print(arr1)
# arr2=np.arange(1,10,2)
# print(arr2)
# arr3=np.arange(0,1,0.2)
# print(arr3)
# arr4=np.arange(-5,0,)*-1
# print(arr4)
# arr1=np.linspace(1,2,180,endpoint=False,retstep=True)
# print(arr1)
arr=np.logspace(2,8,5,endpoint=False,base=2)
print(arr)